Cross-story installation of viscous dampers in timber frame houses for earthquake damage reduction
Cross-story installation of viscous dampers in timber frame houses for earthquake damage reduction
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DOI：
10.3389/fbuil.2022.1037832
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Yutaka Nakamura;Ryota Matsumura
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文献类型：
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作者：
Yutaka Nakamura;Ryota Matsumura
木框架结构通常用于房屋建筑中，其使用方形木梁、柱和墙作为侧向承重构件。小型粘滞阻尼器可应用于木结构房屋，以减少大地震造成的破坏。阻尼器通常安装在层间（相邻楼层之间），以吸收振动能量并减少地震反应。另一种方法是跨楼层安装，其中阻尼器安装在结构的屋顶和底部之间，穿过中间楼层。本研究通过对2016年熊本地震等大地震中的2层木结构房屋进行2自由度模型的特征值分析和地震反应分析，研究了跨层设置粘滞阻尼器的效果。我们比较了阻尼系数和反应减少的影响，跨层安装与传统的层间安装。结果表明，跨层设置阻尼器比层间设置阻尼器能更有效地减小层间位移。此外，跨楼层安装减少了一半的阻尼器，防止严重损坏所需的数量。最后，跨层安装允许第一层的粘滞阻尼器吸收的振动能量几乎是层间安装的两倍。因此，虽然跨层阻尼器通常安装在固定到房子的外部框架上，我们的研究结果得出结论，它可以应用到现有的房子作为抗震改造措施。
Timber frame structures are commonly used in housing construction that use squared-off timber beams, columns, and walls as lateral load-bearing members. A small-size viscous damper can be applied to timber frame houses to reduce damage caused by major earthquakes. Dampers are normally installed inter-story (between adjacent floors) to absorb vibration energy and reduce seismic response. Another method is the cross-story installation wherein a damper is installed between the rooftop and base of the structure across intermediate floors. This study investigated the effectiveness of cross-story installation of a viscous damper by conducting eigenvalue analyses of 2DOF models and earthquake response analyses of a two-story timber frame house subjected to the 2016 Kumamoto earthquake and other major earthquakes. We compared the damping factors and response reduction effects of the cross-story installation with those of conventional inter-story installations. The results showed that the cross-story installation of dampers was more effective than the inter-story installation in terms of reducing story drift. Furthermore, the cross-story installation reduced the number of dampers required for preventing severe damage by half. Finally, the cross-story installation allowed the viscous damper in the first story to absorb vibration energy nearly twice as much as that of the inter-story installation. Therefore, while the cross-story damper is typically installed on an outer frame fixed to the house, our results conclude that it can be applied to an existing house as a seismic retrofitting measure.